Set env vars for build scripts too (#3370)

Author: illicitonion

crate_universe/src/rendering.rs

@@ -367,6 +367,11 @@ impl Renderer {
                 .common_attrs
                 .rustc_env_files
                 .insert(":cargo_toml_env_vars".to_owned(), None);
+            if let Some(ref mut build_script_attrs) = &mut krate.build_script_attrs {
+                build_script_attrs
+                    .rustc_env_files
+                    .insert(":cargo_toml_env_vars".to_owned(), None);
+            }
         }
 
         let mut starlark = Vec::new();

examples/crate_universe/cargo_local/BUILD.bazel

@@ -23,5 +23,6 @@ build_test(
     targets = [
         # This target would fail to build if cargo_toml_env_vars didn't properly populate $CARGO_PKG_REPOSITORY.
         "@crate_index_cargo_local//:autometrics",
+        "@crate_index_cargo_local//:aws-lc-rs",
     ],
 )